Is that the same one that sometimes asks you to click on motor cycles and zebra stripes in a loop and you never come out? (this happens often especially if you're on a somewhat uncommon IP address, like an IPv6 /48 with just a few customers on it)

That’s V2. V3 is always invisible and only returns a score. It’s not unusual to redirect low scorers to a v2 challenge, but afaict you have to set that up by hand.